I'd also be worried about the weight loss. Players generally lose weight during the season. Kobe was worn down at the end of last season -- so with less weight to sustain him he may be even more worn down and tired at the end of this season.

people that jog every morning are not worn down by playing a basketball game. its all a matter of how good kobe's joints are and they are fine right now he will be a big impact next year as long as his quickness does not quickly end in injury.